6 Installation
FLUXUS F60* 6.2 Transducers
37
UMFLUXUS_F60xV5-0EN, 2017-10-16
Rust, paint or deposits on the pipe absorb the sound signal. A good acoustic contact be-
tween the pipe and the transducers is obtained as follows:
• Clean the pipe at the selected measuring point.
– If present, the paint layer has to be smoothed by grinding. The paint does not need to
be removed completely.
– Remove rust or loose paint.
• Use coupling foil or apply a bead of acoustic coupling compound along the center line
of the contact surface of the transducers.
• Observe that there must be no air pockets between the transducer contact surface and
the pipe wall.
6.2.1.3 Selection of the measurement arrangement
Observe the selection criteria for the pipe and the measuring point.
Diagonal arrangement with 1 beam Reflection arrangement with 1 beam
• wider flow velocity and sound speed
range compared to the reflection ar-
rangement
• use in the presence of deposits on the in-
ner pipe wall or with strongly attenuating
gases or liquids (only 1 sound path)
• smaller flow velocity and sound speed
range compared to the diagonal arrange-
ment
• transverse flow effects are compensated
because the beam crosses the pipe in 2
directions
• higher accuracy of measurement be-
cause the accuracy increases with the
number of sound paths
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